Cobalt cyclopentadienyl containing

The groups of both Stephenson (1442) and Maitlis and co-workers (1443) independently prepared pentamethylcyclopentadienyl complexes [Cp M(S2CN- 2)2] (M = Rh, Ir R =Me, Et) upon addition of 2 equiv of dithiocarbamate salt to [Cp MCl(p-Cl)]2. Like the analogous cobalt cyclopentadienyl complexes, they contain both a monodentate and a bidentate dithiocarbamate [Cp Rh(S2CNMe2)2] (319) (Fig. 180) is characterized by the v(C—N) vibrations spectrum at 1392 and 1530 cm , respectively, in the IR spectrum. In solution, interconversion of the two dithiocarbamates occurs (Fig. 180). The NMR line shape analysis suggests that it occurs via a dissociatively controlled intramolecular mechanism. 

Alike metallocomplex anion-radicals, cation-radicals of odd-electron structure exhibit enforced reactivity. Thus, the 17-electron cyclopentadienyl dicarbonyl cobalt cation-radical [CoCp(CO)2] undergoes an unusual organometallic chemical reaction with the neutral parent complex. The reaction leads to [Co2Cp2(CO)4]. This dimeric cation-radical contains a metal-metal bond unsupported by bridging ligands. The Co—Co bond happens to be robust and persists in all further transformations of the binuclear cation-radical (Nafady et al. 2006). 

A. R. Kudinov, A. A. Filchikov, P. V. Petrovskii, and M. I. Rybinskaya, 30-Electron Cationic Iron- and Cobalt-containing Triple-Decker Complexes with a Central Cyclopentadienyl Ligand. The First Synthesis of the Parent Triple-Decker Iron Complex with Cyclopentadienyl Ligands, [( 5-C5H5)Fe(p-jy jy-C5H5)Fe(jy5-C5H5)]PFg, Russ. Chem. Bull. 48, 1352-1355(1999). 

First, SOMC was applied to Co promotion of M0/AI2O3 sulfide. As shown in Fig. 1, the choice of complex was important for uniform distribution of Co over catalyst pellets. Probably due to its too high reactivity, bis(2,4-pentanedionato)cobalt(II) (Co(CsH702)2) resulted in over-concentration of Co in oirter region of the pellets (Fig. la), while bis(cyclopentadienyl)cobalt (Co(CioHio)2) led to a uniform distribution over the entire catalyst pellets at the same concentration of Co (Fig. lb). Selective reaction between Co-containing complexes and Mo sulfide edge sites should give more efficient Co-promotion. More local analyses like EDS and IR(CO) should be done to verify if, by use of Co(CioHio)2, closer association was really achieved between sulfide slabs and incorporated Co. 

Bunz and co-workers reported the preparation of polymers containing cyclopentadienyl-cobalt moieties coordinated to cyclobutadiene rings, using diethylnyl and dipropynyl cyclobu-... 

Analogous materials with cyclopentadienyliron units coordinated to cyclopentadienyl ligands in the main chain, but with shorter G2 spacers, were described in Section 12.06.3.2.2. Polymers with cyclopentadienyl cobalt groups in the main chain have been reported via the treatment of precursor materials that contain cyclopentadienylcobalt groups (e.g., 147) with /-butyl isocyanide followed by... 

J. P. Dieks, M. Zubair, E. S. Davies, C. D. Garner, C. Schulzke, C. Wilson and J. MeMaster, Synthesis, Strueture and Redox Properties of Asymmetric (Cyclopentadienyl)(ene-l,2-dithiolate)cobalt(III) Complexes Containing Phenyl, Pyridyl and Pyrazinyl Units, Eur. J. Inorg. Chem., 2015, 3550-3561. 

Diiodomethane added dropwise at 20° to dicyclopentadienyl cobalt in benzene, stirred 4 hrs., Altered, coned, in vacuo by warming briefly at 30°, the residue containing the intermediate dissolved in methanol, and stirred 0.5 hr. at 35° cyclopentadienyl cyclohexadienyl cobalt iodide. Y 94%. G. H. Herberich and J. Sdiwarzer, B. 103, 2016 (1970). 

The use of a cyclopentadienyl ligand containing a pendant phosphine arm allowed the isolation of the cobalt alkyne complexes [<5o(ti5 i -C5H4CH2CH2l Bu 2)(Tl -PhCCR)] (R = H, Hi). In the case of ethyne, the alkyne complex could not be isedated and the vinylidene complex [ 50(115 I-C5H4CH2CH2PBu 2)(=C=CH2)1 was observed. 

Vapors of nickel and cobalt react to give compounds containing allyl, cyclopen-tadiene, and cyclopentadienyl ligands ... 

The use of polystyrene-bound (n "cyclopentadienyl)dicarbonyl-cobalt as a catalyst " prompted us to synthesize monomers contain ing this metal. Reactions of with an equimolar mixture of... 

Polymers containing pyridine moieties in the mainchain (13) are likewise obtainable by the reaction of the polymers (3) with nitriles (scheme 9). In this case, polymers containing pyridine moieties (about 80%) are produced with an increase of the molecular weight of the polymers. The increase of the molecular weight is most probably due to the pyridine formation of the nitriles with the acetylene moieties at the polymer end catalyzed by the eliminated ( n -cyclopentadienyl)cobalt(I). In fact, it is also possible to prepare pyridine-containing polymers directly from diynes and nitriles in the presence of catalytic amount of 4 (scheme 10). Within the examined combinations, this catalytic polymerization by the pyridine-ring-formation process is... 

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